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Photonic GHz to THz tunable signal generation by chirped-pulse mixing

Johan Stigwall (Institutionen för mikroteknologi och nanovetenskap, Fotonik) ; Andreas Wiberg (Institutionen för mikroteknologi och nanovetenskap, Fotonik)
2006 European ISIS Workshop, Emerging Optical Broadband Technologies, Boppard am Rhein, Germany, May 29 - June 1, 2006 (2006)
[Konferensbidrag, refereegranskat]

Frequency-tunable generation of pulsed tones in the millimeter to sub-millimeter range was demonstrated by mixing of two chromatically dispersing femtosecond laser pulses split up in time by an adjustable differential group delay (DGD) and a polarizer. The signal frequency was set by adjusting the amount of DGD and the amount of dispersion, and was here tuned from below 1 GHz to 0.9 THz. Time-domain measurements were conducted using a sampling oscilloscope for the lower frequencies and an auto-correlator for the higher frequencies. Near 100% modulation depth was obtained, and the signal phase was very stable, being locked to the pulses from the femtosecond laser. The line-width of the mm-wave waveform was found to be transform-limited if the signal chirp induced by higher order dispersion was compensated for. Suggested applications for this system are for instance THz spectroscopy, characterization of high performance photo-diodes and real-time dispersion measurements.

Nyckelord: Microwave photonics, fiber optics, submillimeter-wave generation, photomixing



Denna post skapades 2007-01-05. Senast ändrad 2013-06-19.
CPL Pubid: 24954